Even though the new 2013 SRT Viper has been fully revealed, we have yet to slide behind the wheel of one or hear what the car sounds like in its natural habitat: the racetrack. Good news on one front! We were sent some photos and brief video of a pair of GTS models ripping around GingerMan Raceway here in Michigan, and the 640-hp V-10’s exhaust note sounds pretty damn good—well, at least in the first clip before the stupid wind kicked up. The second part of the video still gives a quick look at the Viper at speed.

We’re told that the Vipers—there were three examples, but a red, non-GTS with white stripes stayed parked—were accompanied not only by Chrysler employees but also a film crew. In all likelihood, the team was there shooting promotional or analytic footage for SRT’s new sports car—and track testing the prototypes, of course—but either way they weren’t exactly keeping things under wraps. Which is good, because we have the photos and video below. Enjoy.